Liquid operated pump



May 25, 1937. c. JfcoBERLY LIQUID OPERATED PUMP Filed July 18, 1932 4Sheets-Sheet 1 f/v VEN To@ C/a fence d Cabe r9,

a E R u u 7 wm Wm 4,6 E fo QN n PA Pr r m mc wo ATTO/UVEK May 25, 1937.c. J. coBERLY 2,081,220

LIQUID OPERATED PUMP Filed July 18, 1952 4 Sheets-Sheet 2 .C/a ren ce dCob@ r@ TTO/Q/VEK 4 Sheets-Sheet 5 May 25, 1937. c. J. coBERLY LIQUIDOPERATED PUMP Filed July 18, 1952 May 25, 1937- c. J. COBERLY' 2,081,220

LIQUID OPERATED PUMP Fil'ed July 18, 1952 4 Sheets-Sheet 4 C/arence d(ber/j) Patented Maly 25, 1937 UNITED sfm'riezsv PATENT OFFICE LIQUIDOPERATED' PUMP Application July 18, 1932, Serial No. 623,171

34 Claims.

My invention relates to pumps and particularly to pumps which areadapted to be immersed in the fluid in a well and to be operated by a,co1- umn of liquid under pressure. Such pumps are i adapted to be usedin oil wells and particularly in deep oil wells from which it is dilcultto pump the iluid using the conventional type of pump operatedmechanically through sucker rods.

Various types of liquid operated pumps have been devised in which theconventional sucker rods are dispensed with and the pump is actuated byliquid under pressure forced downwardly thereto from a pressureproducing source located above the surface of the ground. These liquidactuated pumps may be broadly divided into two classes; namely, thealternating type in which the actuation of the pump is accomplished byvariations in pressure in the actuatingfluid so that it alternatelyflows up and down in the supply pipe leading to the pump, and the directtype in which the oil in the supply pipe is maintained under a more orless constant pressure and ilows constantly in one direction. Myinvention relates tothe direct type of pump.

In the direct type of liquid actuated pumps the oil is pumped from thewell through a pump which is actuated by a. iluid motor usuallyimmediately adjacent the pump, this iluid motor being actuated by liquidunder pressure delivered thereto by a supply pipe.

It is an object of my invention to provide a pump of this characterwhich will have relatively few moving parts, which will be very positivein its operation, and which will be double acting so as to provide alarge capacity.

It is a further object of my invention to provide special means formaintaining an efficient lubrication of the pump and to prevent unduewear of the working parts of the pump and the motor.

Further objects and advantages will be made evident hereinafter.

Referring to the drawings, which are for illustrative purposes only:

Fig. 1 is a general assembly View, partly in section. showing the methodof assembling the pump in the well.

Fig. 2 is a. diagrammatic sectional view of the pump, the parts beingshown in the positions they assume at the beginning of the down-stroke.

Fig. 3 is a diagrammatic sectional Iview of a portion of the pump shownin Fig. 2 with the parts in the position they assume at the beginning ofthe up-stroke.- l

Fig. 4 is a diagrammatic sectional view of the valve mechanism with theparts in the position they assume just prior to the upward movement ofthe valve.

Fig. 5 is a diagrammatic sectional View of the parts in the positionthey assume just prior to the downward movement of the valve. 5

Fig. 6 is a vertical section through the upper portion of a pumpconstructed in accordance with my invention, the left-hand half of thissection being taken on a plane at 30 from the plane of the right-handhalf of the section. 10

Fig. '1 is a sectional view of the central portion of the pump, aportion of which is shown in Fig. 6.

Fig. 8 is a section through the lower portion of this pump, theleft-hand halves of Figs. '7 and 8 being taken on a plane at 45 from theplane of 15 the right-hand halves of these iigures.

Fig. 9 is a, section on a. plane represented by the line A-A of Fig. `6.

Fig. 10 is a section on a plane represented by the line B-B of Fig. 6.20

Fig. 11 is a section on a plane represented by the line C-C of Fig. 6.

Fig. 12 is a section on a plane represented by the line D-D of Fig. 6.

Fig. 13 is a section on a plane represented by 25 the line E--E of Fig.6.

Fig. 14 is a section on a plane represented by the line F-F of Fig. 6.

Y Fig. 15 is a. section on a plane represented by the line G--G of Fig.7. 30

Fig. 16 is a section on a plane represented by the line H-H of Fig. '7.

Fig. 17 is a section on a plane represented by the 'une J-J of Fig. '1.

Fig. 18 is a section on a plane represented by 35 the'line K-K of Fig.7.

Fig. 19 is a section on a plane represented by the line L-L of Fig. 8.

Fig. 20 is a section on a plane represented by the line M-M of Fig. 8.

Fig. 21 is a section on a plane represented by the line N-N of Fig. 8.

Fig. 22 is a section on a plane represented by the line O-O of Fig. 8.45

Fig. 23 is a section on a plane represented by the line P-P of Fig. 6.

Fig. l shows a typical assembly of parts used in the practice of myinvention. In this gure 3l is the casing of the well which may beperforated 50 near the lower end as shown at 32, and which is secured atits upper end in gas-tight relationship with a casing head 33. Carriedinside the casing 3| is a string of tubing 3l which is threaded as shownat 35 in the casing head 33, the space 36 55 between the tubing 34 andthecasing 3|`being hereinafter referred to as the gas space.

which event gas at substantially atmospheric.

pressure will be maintained in the gas space 3B, or the pipe 37 may beconnected to suitable pressure or vacuum producing means so that thespace 38 may be maintained either above or be low atmospheric pressure.

Carried inside the tubing 34 is a. pressure pipe 4| which is threaded inthe casing head as shown at 42, the space 43 between the supply pipe 4Iand the tubing 34 being hereinafter referred to as the exhaust space. Alow pressure oill pipe 44 connects to the upper end of this space, beingthreaded in the casing head 33. This pipe 44 may lead to a gas trap orsuitable storage, neither of which is shown. A high pressure oil pipe 45is threaded in the casing head 33 and delivers oil under pressure to theinterior of the supply pipe 4|. This supply of oil may be derived from apump or other suitable means not shown. It is desirable for the properoperation of the invention that the oil supplied through the pipe 45 befree from sand or other gritty material.

In the lower end of the tubing 34 I provide a conical seat 48 which isengaged by a similar seat carried on the lower end of the supply pipe 4|or upon a member attached thereto, as will hereinafter be explained. Thepurpose of the conical seat 48 is to close the lower end of the exhaustspace 43 and to allow the supply pipe 4| and the various membersattached thereto to be withdrawn vertically from the tubing 34 withoutdisturbing the tubing. The supply pipe 4| carries the pump and liquidmotor, as will hereinafter be explained. In practice when the pump is inoperation a high pressure is maintained inside the supply pipe 4| forthe purpose of actuating the motor, as will hereinafter be explained.

'I'he operation of the mechanism shown in detail in Figs. 6 to 22inclusive will be better understood if the general principles upon whichthe pump operates are first explained and for this purpose Figs. 2, 3,4, and 5 have been made. It should be understood that these drawings donot represent the actual method of assembling the elements, and thatthey are provided merely for the purpose of facilitating anunderstanding of the method of operation of the invention.

Referring to Fig. 2, it will be seen that the pump includes a motorpiston 5| and a pump piston 52, these pistons being connected by apiston rod 53. Projecting upwardly from the motor piston 5| is an upperplunger 54, and projecting downwardly :from the pump piston 52 is a-lower plunger 70. The motor piston 5| drives the pump piston 52 throughthe piston rod 53, these pistons being reciprocable in their individualcylinders, as will hereinafter be explained.

The pump which I employ is of the double acting type; that is to say,both the space above the piston 52 and the space below the piston areeffective in pumping oil.. Oil is drawn through a supply opening 55 fromthe well. On the upstroke, this oil is taken through a valve 56 into thespace below the piston, oil simultaneously being forced out from thespace above the piston through a valve 5'| into the 'exhaust space 43,which in the actual pump is the space between the supply pipe and thetubing. On the downstroke of the pump oil is taken from the space 55through a valve 58 into the space above the piston, oil being forced outfrom the space below the piston into the exhaust space 43 through avalve 59. For the purpose of regulating the supply of huid to the motor,I provide a valve 8| which slides in a valve chamber above the motorpiston, and which controls the now of liquid under pressure fromy insidethe supply pipe 4|. Fluid is supplied to the motor cylinder throughpassages 62 'and 63, the passage 62 leading to the upper end of thecylinder, and the passage 63 leading to the lower end.

The operation of the valve will be better understood by a referencetoFigs. 4 and 5 in which the` parts are not shown assembled in themanner actually used by me in the pump shown in Figs. 6 to 2,3inclusive, Figs. 4 and 5 being merely diagrains to illustrate themethodof operation of the actual mechanism. r

In Fig. 4 the valve 6| is shown in its lower position and in Fig. 5 itis shown in its upper position.. With the valve 6| in its lowerposition, the lower end of the motor cylinder is in open communicationwith the exhaust space 43 through the passage 63, a port 64, a centralgroove 65 in the valve 6|, and a port B6. Due to this communication thespace below the piston 5|`is at substantially exhaust pressure, thispressure being very much below the pressure maintained inside the oilsupply pipe 4|. The oil supply pipe delivers pressure to a pressurespace B1 shown in Fig. 2, a portion of this space being shown in Figs. 4and 5. The space 61 (and all space connecting therewith) is constantlyunder the maximum supply pressure and with the valve in the positionshown in Fig. 4, oil under this pressure is delivered through an opening68 in the valve through a port 69 into the passage 62 from which oil isdelivered to the space above the piston 5|.

With the valve in the position shown in Fig. 4, it will be seen thatpressure is exerted on the top of the piston 5| tending to force itdown, the space below the piston being in open communication with theexhaust space 43 so that liquid can escape from below the piston intothe exhaust space. As the piston 5| moves downwardly, the upper plunger54 also moves downwardly. This upper plunger 54 is grooved as shown at19, this groove being of suilcient length to provide an opencommunication from the space 61 to a port 'Il which communicates with aspace '|2 below the end of the valve 6|. As the plunger 54 continues tomove downwardly from the position shown in Fig. 4, the port provides anopen communication with the space 61 through the groove 19, and oilunder pressure is delivered tov .valve operates on the principle ofdifferential pressures, the upward pressure on the larger area f thelower end of the valve overcoming the downward pressure on the smallerupper end of the valve.

It will be noted from an inspection of Figs. 4 and that the groove 65 isalways in open communication with the exhaust space, 43 through rushesinto the chamber 12, and if the orifice 88 y the port 66, and a lowpressure always exists in this space. i

. The admission of high pressure oil to the `space 12 through the port1| as just described lorces the valve 6| from the 'position shown inFigs. 2 and 4 'tothe position shown in Fig. 5. In the position shown inFigs. 3 and 5, the passage 82 communicating with the space above thepiston 5| `ls in open communication with the exhaust space 43 throughthe port 68, the groove of the valve, and the port 66. The space belowthe piston 5| is in open communication with the pressure space 61through the port 64 and through a port 15 formed in the valve 6|. In theposition of the valve shown in Figs. 3 and 5 high pressure oil istherefore supplied to the space below the piston 5| and the oil abovethe piston 5| is allowed to escape through the passage 62 to the exhaustspace 43. This causes the piston 5| to move upwardly.

The upper plunger 54 is provided with a groove 18, this groove being ofsufficient length to provide an open communication between the port 1|and a port 11 which communicates with the exhaust space 43. With theplunger 54 in its extreme upper position, which occurs as the plungermoves upwardly from the position shown in Fig. 5, the space 12 isconnected to the exhaust space 43, the high pressure is relieved fromthe space 12, and the4 high pressure oil from the pressure space 61 actsupon the top of the valve 8| and forces it back into the position shownin Fig. 4.

A compression spring 18 is provided in the space 12 which acts upon thevalve 6 I, tending to hold it in its upper position. This spring is notabsolutely necessary to the operation of the pump but insures the valvebeing initially in the upper position when it is desired to startoperations. A stop 8| is provided on the valve to limit its downwardmovement.

`For the purpose of locking the valve 6| in either its upper or lowerposition when the plunger 54 is in any intermediate position, I providea port 82 in the valve, this port having a velry small orifice 83communicating with the space 12. The upper end of the port 82communicates with the port 15. This port 15 communcates with the passage63 through a port 86 with the valve in its lower position as shown inFig. 4. With the valve in this position there is therefore an opencommunication between the passage 12 and the exhaust space 43 throughthe orifice 83, the port 32, the port 15, the port 85, the passage 63,the groove 65 in the valve, and the port E6. In other words, with thevalve in the lower position as shown in Fig. 4, exhaust pressure ismaintained in the lower end of the valve until the plunger 54 has movedto its extreme lower position and admits high presure oil to the space12 through the groove 19.

With the valve in the upper position as shown in Fig. 5, full supplypressure is maintained in the space 12 through the port 15, the port 82,and the orifice 83 until this space 12 is open to exhaust by the groove16 in the plunger 54.

The purpose of the port 82 and the orifice 83 is therefore to lock thevalve in its upper and lower positions. It is, however, necessary thatthe orifice 83 be very small. This will be understood from the followingexplanation.

With the parts in the position shown in Fig. 4, the space 12 is atexhaust pressure. As soon as the groove -19 opens this space to supplypressure through the orifice 1|, -high pressure oil were large, thishigh pressure oil would discharge through the oriflce 83 as fast as itentered the chamber 12, and passing through the port 82, the port 15,and the port 85; would be delivered into the passage 63, passingtherethrough into the exhaust space 43. By making the orifice 83 verysmall, the amount of high pressure oil which can be drained out ofthechamber 12 through the orifice 83 is very small and pressure rapidlybuilds up in the chamber 12 to a sufficient degree Vto move the valvebefor any appreciable amount of oil can flow through the orifice 83. Atthe moment the valve starts upwardly from the position shown in Fig. 4,there is a small spurt of oil through the orifice B3 into the port 82,but as soon as the valve moves upwardly a short distance, the port 86 isclosed and this spurt stops. Similarly, the parts being in the positionshown in Fig. 5 and the chamber 12 containing high pressure oil, as soonas the oil from the chamber 12 can escape through the groove 16 and theport 11 into the exhaust space 43, there is a spurt of high pressure oilthrough the orifice 83 into the chamber 12. The supply of oil throughthe orifice 83 is not suicient, however, to build up pressure in thechamber 12 and the valve moves downwardly. As the valve 6| movesdownwardly, the port 15 is closed to the high pressure source of supplyand the flow of oil through the orifice 83 ceases.

The method of operation of the device shown diagrammatically in Fig. 2is as follows:

lAssuming that the parts are in the position shown in that figure andthat the plunger 54 has moved upwardly a small distance further thanthat sh-own in Fig. 4 so that the ports 1| and 11 are connected throughthe groove 16, the valve 6| will have been forced down into the positionshown in Fig. 2 and Fig. 4. In this position the valve 6| connects thespace below the piston with the exhaust space 43 and connects the spaceabove the piston 5| with the pressure space 61. High pressure oiltherefore flows from the pressure space G1 in to the space above themotor piston 5I and low pressure oil is forced out of the space belowthe piston into the exhaust space 43.

Just before the piston 5| reaches its extreme lower position, the groove19 in the upper plunger 54 connects the port 1| with the high pressurespace 61 and the valve moves upwardly into the position shown in Fig. 5.In this position high pressure oil is admitted from the pressure space61 to the space below the motor piston 5| and low pressure oil escapesfrom above this piston to the exhaust space 43 as the piston 5| movesupwardly. Just before the piston 5| reaches its upper position as shownin Fig. 2, the ports 1| and 11 are again connected through the groove 1Gand the valve 6| is forced downwardly and the cycle just described isrepeated.

In brief, the valve 6| controls fluid pressure which moves the piston5|, the piston 5| moves the plunger 54, and the plunger 54 controlsfluid pressure which moves the valve 6|. As a result, the motor piston5| is reciprocated and reciprocates the pump piston 52. It will be notedthat the low pressure oil from the motor cylinder and the oil pumped bythe pump cylinder both flow int-o the exhaust space 43. therefore flowsdownwardly through the supply pipe 4| and is used to actuate the motor(its proper distribution in the motor being made by the valve 6|) and itthen flows upwardly `with the oil being pumped through the exhaust spaceHigh pressure oil 43 to the oil outlet pipe 44 throughwhlchit passes tosuitable storage.

Many oil wells produce considerable sand or gritty material which issuspended in the oil, and

which is quite abrasive. `Since the proper opera- `pressure oil beforedelivering this oil to the upper end of the supply pipe 4 I. I do notshow any means of doing this but it can readily be accomplished bycentrifugal devices and/or illters.

This clean' high pressure oil is delivered toallv wearing surfaces aswill now be explained.

Through the center of the plunger 54, the piston rod 53, and the plunger10, a hole 90 is provided which delivers high pressure clean oil fromthe high pressure space 51 to a closed cavity 9| into which the plunger10 projects. The oil in the cavity 9| being under higher pressure thanthe oil below the pump piston 52 (which is never at a pressurematerially higher than the pressure in the exhaust space 43), this cleanoil tends to work upwardly around the outside of the plunger 10 and toprevent the oil being pumped from working into the space between theplunger 10 andthe inner walls of the opening in which lt slides. Anumber of small holes 92 also conduct this Ahigh pressure oil from thehole 9| to the working periphery of the pump piston 52 and the-peripheryof the motor piston 5 I, thus insuring positive clean oil lubricationthereof. The upper plunger 54 has no contact with the oil being pumped,and its upper end projects into the pressure space 61 which is alwaysfull of high pressure clean oil and thus constantly lubricated. I havefound that by the use of clean oil as a motive liquid and as a lubricantfor the working parts, I can provide a pump which will lift sandy oillwithout rapid wear of the working parts.

As previously explained, Figs. 2 to 5 inclusive `are intended to bediagrammatic. A pump constructed as shown therein would be perfectlyoperative, but owing to space limitations it could not be used in deepoil wells which in some cases have casing 3| not over four inches insidediameter. For use in such locations I provide a compact form of pump asshown in Figs. 6 to 22 inclusive.

'I'he design of a pump assembly having an out- -side diameter of lessthan four inches and capable of operating with high pressure oilpresents great spatial and constructionall diillculties. My methods ofsolving these dificulties will be evident from the followingdescription.

The pump shown in Figs. 6 to 23 operates in the same manner as the pumpshown in Fig. 2 and the main elements are the same in both pumps.

Referring to Fig. 6, the supply pipe 4| is threaded in a collar |0| intowhich is threaded an outer valve body |02. The valve 5| 'fitting andsliding in the valve body |02 has the same general charactertistics asthe valve 5| shown in Figs. 2 to 5 inclusive, although of somewhatdifferent dimensions.V It has the circumferential groove 55, ports 58,15, and 82, and the small orifice 83. The spring'18 is shown in the'cavity 12. Y

'I'he valve body has the passages 52 and 53, and the ports 59, 55, 54,and 85. For convenience the valve body is made in two pieces, theinnervalve body |03 tting inside the outer valve body |02 y inner valvebody Ina and is provides with the grooves. 10 and 13.

' Threaded on the lower end of the valve body |02 is an outer motorbarrel |04 and situated inside of and concentrictherewith is an innermotor barrel |05 which has an'inner cylindrical surface ntting closelyaround themotor piston 5| which is joined to the plunger 54. The innerbarrel|05 isprovided with longitudinal grooves |05 in its outer surfaceand fits so tightly in the outer barrelv |04 that the latter must beheated before the barrels can be assembled, the outer barrel |04 thenshrinking upon the inner barrel |05 and reinforcing the same. Thegrooves I 06 -form part of the passage 63 leading to the space insidethe inner barrel |05 below the motor .piston 5|. The upper end of theinner barrel |05 abuts a'gainst the lower end of the inner valve 'body|03.

'I'hreaded in the lower end of the outer barrel shrinkage of this barrelnot only grips the inner barrel |05 radially, but it also contractslongitudinally and firmly seats the upper end of the inner barrel |05 onthe inner valve body I 03 and the lower end of the inner barrel |05 onthe projection ||2. I have found by assembling the parts in this manner.that I provide a structure capable of withstanding hydrostatic pressuresof several thousand pounds per square'inch, which is necessary in astructure used for the purposes of my invention. The piston rod projectsthrough the intermediate member III in fluidtight relationshiptherewith.

Held in fluid-tight relationship lwith the bottom of the intermediatemember I I I is an upper valve seat member I I5, this memberrhavlnginlet ports I6 and outlet ports ||1 therein, these holes being closed byballs ||8 and IIB. The balls IIB are heldl in their upper position bycompression springs |20. Situated below the upper valveseat member ||5and held in fluid-tight relationship therewith is an upper valveretaining member A |2`I, this member having a cavity |22 whichcommunicates with all of the ports I I1 and also communicates withcavities |23 in which the springs |20 are placed. These cavities |23communicate through a port I 24 withthe space above lthe pump piston 52.All of the ports ||5 commember |30. The inner pump barrel |28 abutsagainst a. lower valve retaining member |3I which in turn abuts againsta lower valve seat |32. The outer pump barrel |21 is threaded in placewhile very hot and due to its contraction is shrunk tightly against ribsformed on the outer surface of the inner pump barrel |28.

'I'he shrinkage of the outer pump barrel |21 acting incompression on,the inner pump barrel |28, tends to vforce the members ||5, '|2|, |23,

|3I, |32, andv |30 solidly together so as to form uid-tight jointstherebetween.

The lower valve seat |32 is provided with ports |31 and |38, the ports|38 communicating with the space |26 through ports |39, and the ports|31 communicating through ports |40 with the space below the motorpiston 52. Balls |4I and |42 close the ports |31 and |38, the balls |4|being held in their upper position by compression springs |43.

A port |55 extending through the lower inter- -mediate member |30communicates with a space |56 which in turn communicates with an opening|51. A port |58 is formed in the lower intermediate member |30 andcommunicates through a port |59 with the exhaust space 43 formed betweenthe casing 3| and the tubing 34. The opening |51, the space |56, theport |55, and the space |26 together correspond to the supply opening 55of Fig. 2. 'Ihe opening |51, space |56, and the port |55 act as inletopenings to admit oil to the space |26. Oil is drawn from the space |26on the down-stroke of the pump, through the port |25, the balls ||8being pulled downwardly to admit oil to the cavity |22, and through theport |24 to the space above the pump piston 52, and oil is drawninwardly into the space below the piston 52 on the up-stroke of the pumpdue to the ball |42 lifting and drawing oil 'through the port |39 anddelivering it through the port |40 to the space below the. pump piston52. Oil is forced outwardly from the space nside the inner pump barrel|28 above the piston 52 on the up-stroke of the pump through the port|24 and the port |50 due to the balls ||9 lifting, this oil entering theexhaust space 43, and oil is also forced into this exhaust space on thedown-stroke of the pump through the ports |40, |31, |58, and |59 due tothe valve |4| being forced downwardly.

A member |60 threaded in the lower intermediate member |30 provides thecavity 9| into which the lower plunger projects. Threaded on the bottomof the lower intermediate member |30 is a member IBI having a conicalend |62 which lits in fluid-tight relationship with the conical seat 48formed on a member |63. The member |63 is secured in fluid-tightrelationship in a coupling member |64 which is threaded to the bottom ofthe tubing 3|. The bottom of the coupling |64 may also be threaded forthe reception of tubing |65 which may extend down into the oil in thewell, or which may be connected to a gas anchor if desired.

The pistons and 52 are identical in construction and have members and|1| threaded for the reception ofthe piston rod 53 and the plungers 10and 54, the piston rod and plungers having the central opening 80therethrough. The openings 92 extend radially from the central hole 90so as to supply clean oil to the outer periphery of the pistons aspreviously explained.

The operation of the pump proper has been previously explained inconnection with Fig. 2 and the actual construction of the pump shown inFigs. 6, 7, and 8 will be understood from the foregoing description.

My invention comprises a device including a uld motor and a pump placedadjacent thereto and operated thereby, said motor and pump beingsituated in a well and having the function of pumping liquid from saidwell, said function being performed by forcing liquid under pressuredownwardly from a source of fluid supply to said motor, the motor thenoperating the pump, which forces the liquid to be pumped to flowupwardly through the well.

The embodiment of my invention shown in the drawings includes variouselements, all of which are not necessarily parts of the inventionsdefined by the following claims, the elements having various functionsperformed in various ways, which may be defined as follows:

First, an outer tubing suspended in the well and into which the pumpdelivers the uids pumped and into which the motor discharges the fluidused to actuate the motor after said fluid has so operated the motor,said tubing having the function of delivering all of said fluids to thesurface of the ground, said function being performed by providing animpervious wall surrounding a central opening through which said fluidsare free to pass, said impervious wall being of sufllcient strength toresist any pressure to which it is subjected during the operation of thedevice.

Second, an inner tubing having the function of conducting operatingfluid from the source of fluid supply to the pump, said function beingperformed by providing an impervious wall surrounding a central openingthrough which said fluids can pass, said impervious wall havingsufficient strength to resist any pressure to which it is subjectedduring the operation of the device.

Third, a structure having the function of enclosing the pump and motorand other parts. said function being performed by providing parts ofsufficient strength and suitable form.

Fourth, a seal having the function of providing a fluid-tight closurebetween said structure and said inner tubing, said function beingperformed by walls forming surfaces on said structure and said tubingwhich can be brought into gas-tight relationship with each other.

Fifth, a motor piston sliding in gas-tight relationship in a pumpcylinder formed in said structure, said piston having the function ofabsorbing energy from the actuating fluid and delivering said energy tothe pump, this function being performed by applying fluid pressure tosaid piston and transmitting the force so produced through a mechanicalconnection between said motor piston and said pump piston.

Sixth, a pump piston having the function of pumping oil, this functionbeing performed by drawing oil into the pump cylinder through an inletvalve and forcing said oil out of said cylinder through an outlet valve.

Seventh, inlet valves for the pump, each having the function ofpreventing the flow of fluid from the pump cylinder through an inletopening, which function the valve performs by seating whenever this flowoccurs, the valve lifting to allow fluid to flow into said cylinder.

Eighth, outlet valves for the pump, each valve having the function ofpreventing fluid from entering the pump cylinder through an outletopening, which function the valve performs by seating whenever this flowoccurs, the valve lifting to allow fluid to flow out of said cylinder.

Ninth, a main valve having the function of controlling the applicationof fluid pressure to the motor piston, this function being performed bythe valve shifting its position to deliver the fluid to different ports.

Tenth, an auxiliary valve having the function of controlling theapplication of fluid pressure to the main valve, this function beingperformed by the auxiliary valve shifting its position to deliver thefluid to different ports.

' I claim as'my invention:

1. In a device of the character described, the combination of wallsforming a cylinder and including heads at either end thereof; a pistonsliding in liquid-tight relationship in said cylinder between saidheads; a piston rod rigidly secured to said piston and passing throughboth the upper and the lower heads in slidable, liquid-tightrelationship with said heads; a passage extending through said pistonrod; a wall surrounding said piston rod after it has passed through oneof said heads and forming a lubricating liquid 'cavity about said rod;and means for delivering lubrleating liquid to said cavity through saidpassage in said rod.

2. In a device of the character described, the combination of:walls-forming a motor cylinder; a motor piston sliding in duid-tightrelationship with the walls of said cylinder; walls forming a pumplcylinder coaxial with said motor cylinder; a pump piston sliding -influid-tight relationship with the Walls of said pump cylinder; and apiston rod connecting said motor piston and said pump piston and havingla. projecting portion passing axially in fluid-tight relationshipthrough the walls of said motor cylinder into a cavity separated fromsaid motor cylinder, and a projecting portion passing axially induid-tight relationship through the walls of said pump cylinder into acavity separated from said pump cylinder, said rod having an openpassage extending therethrough and connecting said cavities, saidpistons having openings therein through which lubricant from one of saidcavities may be passed from said passage to said cylinder walls.

3. The combination oi: walls surrounding a cylindrical opening; a pistonsliding in said opening in huid-tight relationship with the wallsthereof; a piston rod rigidly connected to said piston and passing influid-tight relationship through said walls, one extension of said rodpassing through said walls at one side of said piston, and anotherextension of said rod passing through said cylinder Walls at the otherside oi' said piston, said piston rod with its extensions having anyopen passage through which lubricant may be passed to openings in saidpiston, said openings being connected to said passage and so placed thatthey deliver lubricant to the periphery ofsaid piston; means forbalancing the pressures on the outer ends of said extensions; wallsi'orming a closed cavity into which one of said extensions projects; andmeans for delivering lubricant to said passage.

4. A deep well pump of the kind described comprising a casing having apartition block secured in one end, a motor cylinder casing mounted onthe said block, a piston in said casing. a piston rod on said piston,said rod being. connected at its other end to a pumping piston, a blocksecured in the upper end of said casing, said block having a chambertherein providing a valve for delivering motive iiuid to operate thesaid piston, and a iluid/ motor for operating the said valve, said blockalso having a chamber therein providing a pilot valve, means connectedto the pilot valve and operable by movement of the main piston fordelivering motive iiuid to the said valve operating motor, substantiallyas set forth.

5. A deep well pump comprising a casing having a partition dividing itinto two chambers, a motor-cylinder mounted on the partition, a pistonin said cylinder. a pumping cylinder mounted on the partition, a pumpingpiston in said cylinder.

a common piston rod connecting said motor and said pumping pistons, ablock secured in one end of said casing, said block having a Vchambertherein providing a valve for controlling motive fluid to operate thesaid piston and a iiuid motor for operating the said valve, said blockalso having a chamber therein with a pilot valve mounted in the chamber,means connected to the pilot valve and operable by movement of the mainpiston for delivery oi the motive fluid to the said valve operatingmotor, substantially as set forth.

6. In a deep well pump of the character described, the combination of: avalve body adapted to be secured to the lower end of a pressure uiddelivery tube; walls forming a power cylinder at the lower end of saidvalve body, there being passages extending from said. valve body to theupper and lower ends of said power cylinder; a power piston operative insaid power cylinder; control valve means in said valve-body forcontrolling the delivery of pressure fluid into said passages and theopening of said passages to discharge in a manner to producereciprocation of said power piston; a pilot rod extending upwardly fromsaid power piston to said valve body to control the operation of saidcontrol valve means a connecting rod extending downwardly from saidpower piston; a plug member at the lower end of said power cylinderhaving an opening through which said rod extends; a pumping cylinderconnected to the lower endoi said plug member; a pumping pistonoperative in said pumping cylinder. said pumping piston being connectedto the lower end of said connecting rod; upper and lower check valvemeans for said pumping cylinder for controlling the intake and dischargeof a fluid by said pumping cylinder; an extension rod extendingdownwardly from said pumping piston and through said lower check valvemeans; means forming a iiuid chamber receiving the lower portion of saidextension rod; and means for delivering said pressure iluid to saidfluid chamber to provide a iiuid pressure against said extension rod tobalance the uid pressure against the'end oi said pilot rod.

7. In a deep well lpump oi' the'character described, the combination oi:a valve body adapted to be secured to the lower end of apressure iiuiddeliveryl tube; walls forming a power cylinder at the lower end of saidvalve body, there being passages extending from said valve body to theupper and lower ends of saidvpower cylinder; a power piston operative insaid power cylinder; control valve means in said valve body forcontrolling the delivery of pressure duid into said passages and theopening oi' said passages to discharge in a manner to producereciprocation of said power piston; a pilot rod extending upwardly fromsaid power piston to said valve bodyto control the operation of saidcontrol valve means; a connecting rod `extending downwardly from saidpower piston; a plug member at the lower end of said power cylinderhaving an opening through which said rod extends; a pumping cylinderconnected to the lower end of said plug member; a pumping pistonoperative in said pumping cylinder, said pumping piston vbeing connectedto the lower end of said connecting rod; upper and lower check .valvemeans for said pumping cylinder for controlling the intake and dischargeof a iluid by said pumping cylinder; an extension rod extendingdownwardly from said pumping piston and through said lower check valvemeans; and means forming a iiuid chamber receiving the lower portion ofsaid extension rod, there being a passage through said pilot rod, saidpower piston, said connecting rod, said pumping piston, and saidextension rod for delivering said pressure iluid to said fluid chamberto provide a fluid pressure against said extension rod to balance thefluid pressure against the end of said pilot rod.

8. In a deep well pump of the character described, the combination of: avalve body adapted to be secured to the lower end oi a pressure fluiddelivery tube; walls forming a power cylinder at the lower end of saidvalve body, there being passages extending from said valve body to theupper and lower ends of said power cylinder; a power piston operative insaid power cylinder; control valve means in said valve body forcontrolling the delivery of pressure fluid into said passages and theopening of said passages to discharge in a manner to producereciprocation of said power piston; a pilot rod extending upwardly fromsaid power piston to said valve body to control the operation of saidcontrol valve means; a connecting rod extending downwardly from saidpower piston; a plug member at the lower end of said power cylinderhaving an opening through which said rod extends; a pumping cylinderconnected to' the lower end of said plug member; a pumping pistonoperative in said pumping cylinder, said pumping piston being connectedto the lower end of said connecting rod; upper and lower check valvemeans for said pumping cylinder for vcontrolling the intake anddischargeof a iuid by said pumping cylinder; an extension rod extendingdownwardly from said pumping piston and through said lower check valvemeans; and means form.- ing a uid chamber receiving the lower portionVol' said extension rod, there being a passage through said pilot rod,said .power piston, said connecting rod, said pumping piston, and saidextension rod for delivering said pressure fluid to said fluid chamberto provide a fluid pressure against said extension rod to balance thefluid pressure against the end of said pilot rod, and there being iluidpassages connecting the exterior of said pumping piston with saidpassage therethrough. f

9. In a deep well pump of the character described, the combination of za valve body adapted to be secured to the lower end of a pressure fluiddelivery tube; walls forming a power cylinder at the lower end of saidvalve body, there being passages extending from said valve body to theupper and lower ends of said power cylinder; a power piston operative insaid power cylinder; control valve means in said valve body forcontrolling the delivery of pressure fluid into said passages and theopening of said passages to discharge in a manner to producereciprocation of said power piston; a pilot rod extending upwardly fromsaid power piston to said valve body to control the operation of saidcontrol valve means; a connecting rod extending downwardly from saidpowex/ piston; a plug member at the lower end of said power cylinderhaving an opening through which said rod extends; a pumping cylinderconnected to the lower end of said plug member; a pumping pistonoperative in said pumping cylinder, said pumping piston being connectedto the lower end of said connecting rod; upperA and lower check valvemeans for said pumping cylinder for controlling the intake and dischargeof a fluid by said pumping cylinder; an extension rod extendingdownwardly from said pumping piston and through said lower check valvemeans; and means forming a fluid chamber receiving the lower portion ofsaid extension rod, there being a passage through said pilot rod, saidpower piston, said connecting rod, said pumping piston, and saidextension rod for delivering said pressure fluid to said iluid chamberto provide a uid pressure against said extension rod to balance theiluid pressure against the end of said pilot rod, and there being fluidpassages in said power and pumping pistons leading outwardly from thepassages therein to the external faces thereof.

10. In a deep well pump o'i' the character described, the combinationof: a valve body adapted to be secured to the lower end of a pressurefluid delivery tube; walls forming a power cylinder at the lower end ofsaid valve body, there being passages extending from said valve body tothe upper and lower ends of said power cylinder; a power pistonoperative in said power cylinder; control valve means in said valve bodyfor controlling the delivery of pressure fluid into said passages andthe opening of said passages to discharge ina manner to producereciprocation of said power piston; a pilot rod extending upwardly fromsaid power piston to said valve body to control the operation of saidcontrol valve means; a connecting rod extending downwardly from saidpower piston; a plug member at the lower end of said power cylinderhaving an opening through which said rod extends; a pumping cylinderconnected to the lower end of said plug member; a pumping pistonoperative in said pumping cylinder, said pumping piston being connectedto the lower end of said connecting rod; upper and lower check valvemeans for said pumping cylinder for controlling the intake and dischargeof a fluid by said pumping cylinder; an extension rod extendingdownwardly from said pumping piston and through said lower check valvemeans; and means forming a uid chamber receiving the lower portion ofsaid extension rod, there being a passage through said pilot rod leadingto said power piston, and a passage in said power piston connecting theexterior thereof with said passage in said pilot rod, for deliveringiluid under pressure to the space between said power piston and the Wallof said power cylinder for the purpose of lubrication.

11. In a deep well pump of the character described, the combination of avalve body adapted to be secured to the lower end of a pressure fluiddelivery tube; walls forming a power cylinder at the lower end of saidvalve body, there being passages extending from said valve body to theupper and lower ends of said power cylinder; a power piston operative insaid power cylinder; control valve means in said valve body forcontrolling the delivery of pressure fluid into said passages and theopening of said passages to discharge in a manner to producereciprocation of said power piston; a pilot rod extending upwardly fromsaid power piston to said valve body to control the operation of saidcontrol valve means; a connecting rod extending downwardly from saidpower piston; a plug member at the lower end of said power cylinderhaving an opening through which said rod extends; a pumping cylinderconnected to the lower end of said plug member; a pumping pistonoperative in said pumping cylinder, said pumping piston being connectedto the lower end o! said connecting rod; upper and lower check valvemeans for said pumping cylinder for controlling the intake and dischargeor a uid by said pumping cylinder;

' an extension rod extending downwardly from ing piston.

12. In a deep .Well pump oLthe character described, the combination of:a motor element adapted to be installed at the bottom of a well, therebeing a piston vrod extending'down from said motor element; a pumpingcylinder secured to the lower end of said motor element, there beingfluid inlet passages in the wall of said cylinder and fluid dischargepassages extending outwardly from the upper end of`\` said cylinder;intake and discharge check valve means in the upper end of said cylinderconnected to said passages so as to control the flow of fluid into andout of the upper end of said cylinder; a plug connected to the lower endof said cylinder, said plug having a passage from end to end thereofforv conducting fluid to be pumped to said passages of said cylinder,there being a discharge passage leading downwardly from the upper end ofsaid plug and out through the side wall thereof for the discharge offluid; and intake and discharge valve means at the upper end of saidplug connecting said inlet and discharge passages of said plug with thelower interior space of said cylinder.

13. In a deep well pump of the character described, the combination of:a motor element adapted to be installed at the bottom of a well, therebeing a piston rod extending down from said motor element; a pumpingcylinder secured to the lower end of said motor element, there beingfluid inlet passages in the wall of said cylinder and fluid dischargepassages extending outwardly from the upper end of said cylinder; intakeand discharge check valve means in the upper end of said cylinderconnected to said passages so as to control the flow of fluid into andout of the upper end of said cylinder; a plug connected to the lower endof said cylinder, said plug having a passage from end to end thereof forconducting fluid to be pumped to said passages of said cylinder, therebeing a discharge passage leading downwardly from the upper end of saidplug and out through the side wall thereof for the discharge of fluid;intake and discharge valve means at the upper end of said plugconnecting said inlet and discharge passages of said plug with the lowerinterior space of said cylinder; a fluid inlet pipe connected to thelower end of said plug; and a fluid discharge pipe extending upwardlyaround the exterior of said cylinder from a point below the outlet endof said discharge passage of said plug.

14. In a deep well pump of the character described, the combination ofan intermediate plug for connecting together a power cylinder and apumping cylinder, said plug comprising a body having the ends thereofprepared for connection to said cylinders and having a discharge passageleading from one end thereof to a position intermediate the ends thereofand then leading outwardly to the exterior of the body.

15. A deep weil pump of the kind described comprising a casing having apartition block secured in one end, a motor cylinder casing mounted onthe said block,l a piston in said casing, a piston rod on said piston,said rod being connected at its other end to afpumping piston, a blocksecured in the upper end of said motor cylinder casing, said lastmentioned block having a chamber therein providing a valve fordelivering motive fluid to operate the said motor piston, and a fluidmotor for operating the said valve, said block also having a chambertherein providing a pilot valve, means connected to the pilot valve andoperable by movement of the first mentioned motor piston for deliveringmotive fluid to the said valve operating motor, substantially as setforth. l

16. A deep Well pump comprising a casing having a partition dividing itinto two chambers, a motor cylinder mounted on the partition, a pistonin said cylinder, a pumping cylinder mounted on the partition, a pumpingpiston in said cylinder, a common piston rod connecting said motor andsaid pumping pistons, a block secured in one end of said motor cylinder,said block having a chamber therein providing a valve for controllingmotive fluid to operate the said piston and a fluid motor for operatingthe said valve, said last mentioned block also having a chamber thereinwith a pilot valve mounted in the chamber, means connected to the pilotvalve and operable by movement of the first mentioned motor piston fordelivery of the motive fluid to the said valve operating motor,substantially as set forth.

17. In ka combined motor and pump adapted to be inserted in a Well andto pump liquid therefrom, the combination of: a motor mechanismincluding a motor cylinder; a pump mechanism including a pump cylinder;walls confining a first column of high pressure fluid and conductingsaid fluid from a suitable source of high pressure fluid to said motor;walls confining a second column of fluid and conducting same from thepump to the outlet of the well; valve means for alternately applyingsaid columns to either end of said motor cylinder; a motor pistonsliding in liquid-tight relationship in saidmotor cylinder.

and having an upper rod connected thereto and passing in liquid-tightslidable relationship through the walls of said motor cylinder; anintermediate rod operatively connected to said m0- tor piston andpassing in liquid-tight slidable relationship through the walls of saidmotor cylinder into said pump cylinder; a pump piston sliding inliquid-tight relationship in said pump cylinder and operativelyconnected to said intermediate rod; and a lower rod secured to said pumppiston and passing in slidable liquid-tight relationship in the walls ofsaid pump cylinder.

18. In a combined motor and pump adapted to be placed in a well and topump liquid therefrom, the combination of a motor mechanism including amotor cylinder; Walls confining a column of high pressure liquid andconducting said liquid from a suitable source of high pressure liquid tosaid motor; walls confining a column of liquid at lower pressure thansaid high pressure liquid and conducting said liquid at lower pressurefrom said pump to the outlet of the well; a motor piston forming a partof said combined motor and pump; means for so applying said columns tosaid motor piston as to cause it to reciprocate; a pump assemblycomprising Walls connected to said pump piston and passing in slidable,liquid-tight relationship through said upper head, said` upper rod beingrigidly connected to said motor piston at a point above where it passesthrough said upper head; an inlet valve for said pump cylinder in saidupper head; anv

outlet valve `ior said pump cylinder in said upper head; a lower pistonrod passing in slidable, liquid-tight relationship through said lowerhead; an inlet valve for said pump cylinder 'in said lower head; and anoutlety valve for said pump cylinder in said lower head. y

19, In a device of th'. character described, the combination of: wallsconfining a column of high pressure iluid; walls forming a pumpcylinder; a pump piston in said cylinder; piston rod means secured tosaid piston and extending both ways therefrom through the end walls ofsaid pump cylinder, one end of said rod means projecting into saidcolumn of pressure fluid the action of which applies a force tending tomove said rod means; and means for balancing said force of said uidtending to move said rod means, said means exerting an opposing force onsaid rod means.

20. In a device of the character described, the combination of z wallsconfining a column of high `pressure fluid; walls forming a pumpcylinder; a

pump piston in said cylinder; piston rod means secured to said piston,one end of said rod means extending through one end wall of saidcylinder and the other end of said rod means extending through the otherend wall of said cylinder; and means for supplying said pressure fluidto both ends of said piston rod means so that the fluid pressures actingon both ends thereof will be substantially balanced.

21. A pumping mechanism of the character described, including: wallsconfining a column of high pressure fluid; a motor including wallsforming a motor cylinder having a motor piston therein; a pump mechanismincluding walls forming a pump cylinder having a pump piston therein; anupper piston rod secured to said motor piston and extending through anend wall of said motor cylinder, the upper end of said upper rod beingexposed to the action of said high pressure fluid exerting a downwardforce tending to move said upper rod downwardly; an intermediate pistonrod connecting said motor piston and said pump piston; a lower pistonrod secured to said pump piston and extending through an end wall ofsaid pump cylinder; and means for exerting an upward force on said lowerpiston rod tending to balance said downward force on said upper pistonrod.

22. In a device of the character described, the combination of: a iluidoperated motor including walls forming a cylinder; a motor piston insaid cylinder having a passage communicating with the periphery thereof,walls confining a co1- umn of high pressure fluid and conducting samefrom a suitable source to said motor; valve means for supplying saidhigh pressure fluid to said motor cylinder so as to actuate said piston;a pis- 4ton rod secured to said motor piston and extending through anend wall of said motor cylinder, said rod having an opening thereincommunicating with said high pressure fluid and with said passage sothat said fluid may be conveyed through said opening and said passage tothe periphery of said piston to lubricate it.

23, A pumping mechanism of the character described, including: a motorincluding walls forming a motor cylinder having a motor piston therein;a pump mechanism including walls forming a pump cylinder having a pumpDim!! therein; an upper rod secured to said motor piston and extendingthrough an end wall o! said motor cylinder; an intermediate rodconnecting said motor piston and said pump piston, said intermediate rodbeing oi' the same diameter as said upper rod; and a lower rod securedto said pump piston and extending through an end wall of said pumpcylinder, said lower rod being of the same diameter as said upper andintermediate rods.

24. A pumping mechanism of the character described including z' wallsforming a motor cylinder; a motor piston slidably disposed in said motorcylinder; walls forming a pump cylinder and arranged coaxially with saidmotor cylinder a pump piston slidably disposed in said pump cylinder: apiston rod operatively connecting said motor piston to said pump piston;means conducting a column of fluid under high pressure to said pumpingmechanism; means comprising a master valve and a. pilot valveoperatively associated with each other to control the admission o! saidhigh pressure fluid intosaid motor and the exhaust of said fluid fromsaid motor; walls forming passageways for a. second column of fluid andfor conducting the same from said pumping mechanism to a dischargeoutlet; said pilot valve being connected with said motor piston andbeing adapted to be actuated thereby to control movement of said mastervalve by controlling the application thereto of fluid derived from saidcolumns; admission valve means through which said pump piston can drawwell fluid into said pump cylinder on both its up-stroke anddown-stroke; and discharge valve means through which said pump pistoncan expel well fluid from said pump cylinder into said passageways forsaid second column of iluid on both its up-stroke and down-stroke.

25. A pumping mechanism, such as defined in claim 24, in which themaster valve is coaxially arranged with the pump and motor cylinders.

26. A pumping mechanism, such as deilned in claim 24, in which the pilotvalve is rigidly connected with the motor piston.

27. A pumping mechanism, such as deilned in claim 24, in which the pilotvalve is coaxial and rigidly connected with the motor piston.

28. A pumping apparatus including the combination of a motor and pumpadapted to be placed in a Well to pump fluid therefrom; means adapted toconfine a flrst column of fluid under high pressure and to conduct thesame to said motor; means adapted to contain a second column of fluidand to conduct the same from said pump to a discharge means for saidWell; a motor piston reciprocable in said motor cylinder; a pump pistonconnected to said motor piston and reciprocable in said pump cylinder; amaster Valve for admitting fluid from said high pressure column toopposite ends of said motor to successively reciprocate said motorpiston in opposite directions; master valve operating means associatedwith said motor piston and controlling movement of said master valve;inlet means successively admitting well fluid into opposite ends of saidpump; and discharge means successively permitting discharge of Wellfluid from said opposite ends of said pump into said means for saidsecond column of liquid, said master valve operating means controllingmovement of said master valve, by controlling the application thereto offluid derived from said'columns.

29. In a fluid operated well pump, the combination of: a well tubingextending from the l top of the well to a point near the bottom there-`oi; a iiuid operated motor in said tubing, in-

cluding a' motorcylinder having a motor piston therein; a pump mechanismin said tubing below said motor, including a pump cylinder having a pumppiston therein; means operatively connecting said pistons: means forminga seal between said pump mechanism and said tubing; means providing aproduction passage for iiuid between said tubing and said motor cylinderand between said tubing and said pump cylinder; means comprising amaster valve and a pilot valve operative to control the admission oi'iluld under high pressure into said motor and the exhaust of said iluidfrom said motor; said pilot valve being connected with saidv motorpiston and being adapted to be actuated thereby to control movement ofsaid master valve by controlling the application thereto of the lluidunder high pressure and iluid derived from said production passages;inlet means ior conducting well iluid into the lower end of said pumpmechanism; a rst inlet passage in said pump mechanism communicatingbetween said inlet means and the upper end of said pump cylinder; asecond inlet passage in said pump mechanism communicating between saidinlet means and the lower end of said pump cylinder; an upper dischargepassage communicating between the upper end of said pump cylinder andsaid production passage; a lower discharge passage communicating betweenthe lower end of said pump cylinder and said production passage; andinlet and discharge valve means for controlling the inlet and dischargeof well fluid through said inlet and di'scharge passages.

30. In a uid operated well pump, the combination of: a well tubingextending from the top of a well to a point near the bottom thereof; afluid operated motor in said tubing, including a motor cylinder having amotor piston therein, there'being a iirst Huid-receiving space betweensaid motor and said tubing; pump mechanism in said tubing below saidmotor, including a pump cylinder having a pump piston therein, therebeing a second Huid-receiving space between the upper end oi' said pumpmechanism and said tubing, said ilrst and second duid-receiving spacescommunicating with each other; means operatively connecting saidpistons; means forming a seal between said pump mechanism and saidtubing below said second fluid-receiving space; a pipe connected to theupper end of said motor for supplying operating fluid under pressurethereto; means comprising a master valve and a. pilot valve foralternately delivering said operating fluid from said pipe to oppositeends of said motor cylinder so as to reciprocate said motor pistontherein; inlet means in the lower end of said pump mechanism forconducting well fluid thereinto; a iirst inlet passage in said pumpmechanism communicating between said inlet means and the upper end ofsaid pump cylinder;

aosneeoY piston and being adapted to be actuated thereby to controlmovement of said master-valve by controlling the application thereto ofsaid motor operating iluid and fluid derived from said iluidreceivingspaces.

31; In a well pump mechanism, the combination of: a well tubing; a iluidoperated motor in said tubing comprising a motor cylinder and av ductingwell uid into the upper end of said pump cylinder; lower inlet means forconducting well fluid into the lower end of said pump cylinder; upperdischarge means for conducting `well fluid from the upper end of saidpumpcylinder to said production passage; lower discharge means forconducting well duid from the lower end oi' sad pump cylinder to saidproduction passage; a rod connecting said motor piston to said pumppiston; and a second rod connected to and extending beyond said pumppiston to a point below said lower inlet and discharge means.-

32. In a well pump mechanism, the combination of: a, well tubing; afluid operated motor in said tubing comprising a motor cylinder and amotor piston therein; means forming a first uid-receiving space betweensaid motor and said tubing; a fluid pump in said tubing comprising apump cylinder and a pump piston therein; means forming a secondfluid-receiving space between said pump and said tubing,A said rst andsecond duid-receiving spaces being in communication with each other;means forming a seal between said uid pump and said tubing below saidsecond fluid-receiving space; means for alternately admitting operatinguid to opposite ends of said motor cylinder to reciprocate the motorpiston therein; inlet means for respectively conducting well uid intothe upper and lower ends of said pump cylinder; discharge means forrespectively conducting well fluid from the upper and lower ends of saidpump cylinder to said second fluid-receiving space; a rod connectingsaid motor piston to said pump piston; and a second rod extending fromsaid pump piston to a point below the inlet and discharge means in thelower end of said pump cylinder.

33. In a. pumping mechanism for use in deep well pumps, the combinationof: a well tubing having fluid inlet and outlet means, a uid motorhaving a, motor piston and being disposed within said tubing, saidpiston being adapted to be operated by fluid derived from acolumn of thesame under high pressure; a fluid pump having a pump piston operativelyconnected to said motor piston and adapted to be actuated thereby, saidpump also having inlet and discharge means for well iluid; and meanscomprising a master valve and a pilot valve operatively associated withsaid iluid motor to control the admission of said iluid under pressureinto said motor to actuate said motor piston and also to control theexhaust of said uid from said motor, there being passageways associatedwith said iiuid motor and said pump into which exhaust iiuid from saidmotor and the fluid discharged from said pump become intermixed, saidpilot valve controlling movement of said master valve by controlling theapplication thereto of the pressure of fluid derived from said highpressure fluid column and the pressure of fluid derived from thepassageways containing said mixture of motor exhaust fluid and pumpdischarge fluid.

34. In a pumping mechanism for use in deep well pumps, the combinationof: a well tubing having fluid inlet and outlet means. a fluid motorhaving a motor piston and being disposed within said tubing, said pistonbeing adapted to be operated by fluid derived from a column of the sameunder high pressure; a fluid pump having a pump piston operativelyconnected to said motor piston and adapted to be actuated thereby, saidpump also having inlet and discharge means for well fluid; and meanscomprising a master valve and a :let valve operativ-1v associated withsaid uid motor to control the admission of said fluid under pressureinto said motor to actuate said motor piston and also to control theexhaust of said fluid from said motor, there being passagewaysassociated with said uld motor and said pump into which exhaust fluidfrom said motor and the iluid discharged from said pump becomeintermixed, said pilot valve controlling movement of said master valveby controlling the application thereto of the pressure of fluid derivedfrom said high pressure fluid column and the pressure of fluid derivedfrom the passageways containing said mixture of motor exhaust uid andpump discharge fluid, said master valve being responsive to pressuredifferentials and having one end surface of greater area than theopposite end surface thereof.

CLARENCE J. COBERLY.

Disclaimer 2,081,220.O[arence J. O'oberly, Los A Patent dated May 25,1937. assignee, Kobe, I no.

Hereby enters this disclaimer to claims 33 and 34 of said patent.

[Oycz'al Gazette July 10, 1951.]

ngeles, Calif. LIQmD OPERATED PUMP. Disclaimer filed June el, 1951, bythe movement of said master valve by controlling the application theretoof the pressure of fluid derived from said high pressure fluid columnand the pressure of fluid derived from the passageways containing saidmixture of motor exhaust fluid and pump discharge fluid.

34. In a pumping mechanism for use in deep well pumps, the combinationof: a well tubing having fluid inlet and outlet means. a fluid motorhaving a motor piston and being disposed within said tubing, said pistonbeing adapted to be operated by fluid derived from a column of the sameunder high pressure; a fluid pump having a pump piston operativelyconnected to said motor piston and adapted to be actuated thereby, saidpump also having inlet and discharge means for well fluid; and meanscomprising a master valve and a :let valve operativ-1v associated withsaid uid motor to control the admission of said fluid under pressureinto said motor to actuate said motor piston and also to control theexhaust of said fluid from said motor, there being passagewaysassociated with said uld motor and said pump into which exhaust fluidfrom said motor and the iluid discharged from said pump becomeintermixed, said pilot valve controlling movement of said master valveby controlling the application thereto of the pressure of fluid derivedfrom said high pressure fluid column and the pressure of fluid derivedfrom the passageways containing said mixture of motor exhaust uid andpump discharge fluid, said master valve being responsive to pressuredifferentials and having one end surface of greater area than theopposite end surface thereof.

CLARENCE J. COBERLY.

Disclaimer 2,081,220.O[arence J. O'oberly, Los A Patent dated May 25,1937. assignee, Kobe, I no.

Hereby enters this disclaimer to claims 33 and 34 of said patent.

[Oycz'al Gazette July 10, 1951.]

ngeles, Calif. LIQmD OPERATED PUMP. Disclaimer filed June el, 1951, bythe

